Field Screening of Rice Germplasm (Oryza sativa L. ssp. japonica) Based on Days to Flowering for Drought Escape
Department of Plant Genetics and Breeding, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
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Plants 2020, 9(5), 609; https://doi.org/10.3390/plants9050609
Received: 7 April 2020
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Revised: 5 May 2020
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Accepted: 5 May 2020
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Published: 11 May 2020
(This article belongs to the Section Plant Response to Abiotic Stress and Climate Change)
Terminal drought stress is one of the restrictive factors in rice production and is expected to upsurge under the current situation of climate change. The study evaluated the performance of 2030 rice genotypes under continuous drought stress conditions based on days to flowering (DF). The genotypes under augmented randomized complete block design were sown in May/June of 2017 and 2018 in the field with movable rainout that resulted in huge genetic diversity among the accessions. Descriptive statistics confirmed clear variation among accessions on growth duration, plant height to leaf, plant height to panicle, and germination percentage. Correlation, chemometric, and agglomerative hierarchical cluster analyses were performed that categorized the germplasm into 10 groups. Genotypes in clusters VIII and IX (drought-resistant) revealed better agronomic performance in terms of reduced days to flowering, but conversely taller plant height and higher maturity (%) under severe stress. Genotypes in clusters IV, V, and X were discovered to be drought-susceptible. The screened genotypes like Longjing 12, Longdun 102, Yanjing 22, Liaojing 27, Xiaohongbandao, Songjing 17, and Zaoshuqingsen can be utilized in rice breeding improvement programs for drought tolerance in terms of severe continuous drought, as well as terminal drought stress.
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Keywords:
trait; terminal drought stress; rainout shelter; rice genotype; plant height; cluster
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MDPI and ACS Style
Ahmad, M.S.; Wu, B.; Wang, H.; Kang, D. Field Screening of Rice Germplasm (Oryza sativa L. ssp. japonica) Based on Days to Flowering for Drought Escape. Plants 2020, 9, 609. https://doi.org/10.3390/plants9050609
AMA Style
Ahmad MS, Wu B, Wang H, Kang D. Field Screening of Rice Germplasm (Oryza sativa L. ssp. japonica) Based on Days to Flowering for Drought Escape. Plants. 2020; 9(5):609. https://doi.org/10.3390/plants9050609
Chicago/Turabian StyleAhmad, Muhammad S., Bingrui Wu, Huaqi Wang, and Dingming Kang. 2020. "Field Screening of Rice Germplasm (Oryza sativa L. ssp. japonica) Based on Days to Flowering for Drought Escape" Plants 9, no. 5: 609. https://doi.org/10.3390/plants9050609
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